Entangled Light from a Quantum Dot

The observation of Franson interference fringes and a violation of the CHSH inequality demonstrates time-entanglement, evidenced by a correlation function visibility of 92.8±2.6% and a pump power dependence consistent with theoretical predictions, even at an average input photon number of 0.01.

Researchers have demonstrated a robust source of entangled photons using a novel quantum dot technique, paving the way for more efficient quantum communication systems.